Well @MonkeySAN the first 2 addresses are the card id of your dino packs (sometimes the 1st 3 addresses like in the case of TwinYudon pack), like if you change the name of it with something else, you will get a different card. For example like the Henodus in the picture above (will be .Henodus, the first 2 addresses), select the 2 addresses, use UTF-8 and change it to Alberto and buy the pack and you will get the Henodus pack but inside will be an Albertosaurus card. Address 3, 4, 5 and 6 correspond to the card pack photo from which 4th and 5th address is fixed like you said while 3rd and 6th change after every restart, but these last 4 addresses just change the appearance of the pack.
For the VIP Exclusive, yes you need to get the subscription for those packs. You can use Lucky Patcher for that.